<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type='text/javascript' src='../js/vue.js'></script>
</head>

<body>
   <!-- 
       @后面可以写简单语句；
       有牵连的data数据就使用函数；
       @后面语句只绑定vm上的函数
    -->
    <div id="root">
      <h2>
          天气{{info}}
      </h2>
      <button @click = 'changeWeather'>切换天气</button>
    </div>
    <script>
        const vm = new Vue({
            el: '#root',
            data:{
                 isHot:true 
            },
            computed:{
                info(){
                    return this.isHot?'炎热':'凉爽'
                }
            },
            methods: {
                changeWeather(){
                    this.isHot = !this.isHot
                }
            },
        })
        console.log(vm);
    </script>
</body>

</html>